NeuroFlex

Every design choice in this app is anchored to peer-reviewed evidence. Below: the studies that shaped the rules, with plain-language summaries of what they actually found.

No cognitive training app has been proven to prevent dementia. The evidence is strongest for far transfer being modest — meaning gains on trained tasks don't always generalize to daily life (Simons et al., 2016).

What does have robust evidence: aerobic exercise, sleep, the Mediterranean diet pattern, social engagement, and treating hearing loss (Livingston et al., 2020, Lancet Commission).

NeuroFlex is designed as one part of a broader cognitive-health practice — not a substitute for those bigger levers.

NeuroFlex is part of the Grand Living suite — a constellation of small, evidence-anchored wellness tools built by Noah Grand in Sandpoint, Idaho.

This app is offline-first. Everything you see runs on your device. No accounts, no servers, no tracking. Your scores live in your browser's local storage and stay there.

Five domains. Five original games. One adaptive engine. The whole thing fits in a single file.

Every game in NeuroFlex was designed from scratch around a published cognitive paradigm — never copied from a commercial app. Circuit Builder is loosely inspired by Corsi block-tapping (Corsi, 1972). Echo N-Back implements the dual N-Back working memory paradigm (Jaeggi & Au, 2008-2015). Attention Orchestra adapts the dichotic-listening tradition (Cherry, 1953). Divided Field is modeled on the Useful Field of View paradigm from the ACTIVE trial (Rebok et al., 2014). Quick Switch is a task-switching paradigm (Monsell, 2003). Lightning Match measures symbol-substitution throughput in the Digit Symbol tradition (Salthouse, 1996). Idea Chain implements Guilford's Alternate Uses Task (Guilford, 1967). The implementations are original code.

NeuroFlex scores most games with code (timing, accuracy, memory). But the Idea Chain game asks "name uses for an object" — and judging creativity needs more than counting words. So we use two different judges:

1. AI Judge (when you're signed in as a subscriber) — Claude reads your ideas, groups them by category, and rates how unusual each one is. Like having a researcher score the test.

2. Code Judge (free / signed out) — A built-in word list checks roughly which categories you covered, and a frequency table guesses how common each idea is. It's honest, but rougher — code can't really "understand" an idea the way a person (or AI) can.

Sign in with your Grand Living account to use the AI judge automatically. No API key to paste. The same subscription unlocks AI features across all Grand Living apps.

Sound effects: on

Back up your scores and progress to your account so they're available on any device. Off by default — you choose.

Requires sign-in. Turn off anytime. Request data deletion: grandlivingllc@outlook.com

The 2024 Lancet Commission estimates that nearly half of dementia cases — about 45% — are linked to fourteen modifiable risk factors across life. Acting on them may lower risk; nothing guarantees prevention.

The games in NeuroFlex cover the cognitive-engagement piece. The rest lives across the Grand Living suite — this page points you to the right tool for each factor.

Favor: leafy greens, berries, oily fish, nuts, olive oil, beans and lentils, whole grains, vegetables.

Limit: ultra-processed foods, sugary drinks, excess red and processed meat, deep-fried food, heavy alcohol.

This follows the Mediterranean / MIND pattern, where the diet evidence is strongest. For meal plans and recipes, that's Nutrition's job.

Open Nutrition ›

This page is educational and is not medical advice. It can't diagnose anything or prevent disease, and it doesn't replace your doctor. For medication questions or any symptom, talk to a clinician.

What you tap here is stored only on this device — it is never sent to the cloud, even if you've turned on backup elsewhere.